Adding and Subtracting Decimals

Front

What is a decimal?

Back

A decimal is a number that includes a decimal point, which separates the whole number part from the fractional part. For example, 3.14 is a decimal.

Front

How do you add decimals?

Back

To add decimals, align the numbers by the decimal point and add as you would whole numbers, placing the decimal point in the answer directly below the other decimal points.

Front

How do you subtract decimals?

Back

To subtract decimals, align the numbers by the decimal point and subtract as you would whole numbers, placing the decimal point in the answer directly below the other decimal points.

Front

What is the value of 12.3 - 8.47?

Back

The value is 3.83.

Front

What does rounding a number mean?

Back

Rounding a number means adjusting it to the nearest specified place value, such as the nearest whole number or tenth.

Front

Round 12.25 to the nearest tenth.

Back

12.3

Front

What is the result of 10.09 - 4.35?

Back

The result is 5.74.

Front

If Mariah has $33.08 and spends $5.78 and $3.25, how much does she have left?

Back

She has $24.05 left.

Front

What is the first step in solving a decimal addition problem?

Back

The first step is to align the numbers by the decimal point.

Front

What is the first step in solving a decimal subtraction problem?

Back

The first step is to align the numbers by the decimal point.